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Figure 2.1.10 Design concept for slotted ceramic shroud Thermal distortion of the shroud support, i.e., the turbine support casing or the vane ring outer platform, strongly influences thermal stress in the shroud. Steady state thermal analysis showed that the OD platform of the vane grows radially by 0.0158” under hot streak conditions and 0.014” under average inlet conditions. This means the maximum vane ring outer platform distortion is 0.0018”, comparable to the 0.0015” turbine support casing distortion. Therefore, either design was acceptable. Under the worst thermal loading case, i.e. the hot streak conditions, the peak thermal stress was just over 10 ksi in the shroud (see Figure 2.1.11). Figure 2.1.11 Temperature distribution (left side) and thermal stress distribution (right side) of the turbine shroud under hot streak conditions A second major design concern was the relative thermal deformation between the shroud and its support during transient engine operation. To analyze this, thermal growth of the casing and the ceramic shroud during startup and shutdown was predicted. During the – 10F cold start, the turbine support casing was expected to shrink 0.015” more than the ceramic shroud, which meant that a cold build clearance of at least 0.015” was needed. 31PDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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